Offering this nice clean, 12 inch long vintage steel beam trammels with the extra attachment for extending the center to center capacity by linking another (not included) .234 inch diameter rod to the current 12" capacity.  The 2" long adapter can also be used for setting a precision stop to return to previous position. It's in great shape, everything works good, no damage. We don't know who made it as there is no maker's name on it, and no owner's name or mark either. It's made from good quality tool steel, and the points are hardened. A real nice layout tool overall!